@article{fdi:010065402, title = {{L}ong-range transport across the {A}tlantic in summertime does not enhance the hygroscopicity of {A}frican mineral dust}, author = {{D}enjean, {C}. and {C}aquineau, {S}andrine and {D}esboeufs, {K}. and {L}aurent, {B}. and {M}aille, {M}. and {R}osado, {M}. {Q}. and {V}allejo, {P}. and {M}ayol-{B}racero, {O}. {L}. and {F}ormenti, {P}.}, editor = {}, language = {{ENG}}, abstract = {{W}e present the first direct evidence that the hygroscopic properties of super micron (>1 mu m) {A}frican dust particles did not change despite undergoing long-range transport across the {A}tlantic toward the {C}aribbean. {C}oncurrent measurements of chemical composition show that most of mineral dust was chemically unprocessed and externally mixed. {A} minor portion of mineral dust was internally mixed with sulfate and chloride (similar to 13-24% by number) or aggregated with sea-salt particles (similar to 3-6%). {O}nly dust particles aggregated with sea salt showed significant hygroscopic growth above 75% relative humidity ({RH}), resulting in a decrease in extinction mass efficiency by up to a factor 2.2. {A}ll other dust particles did not take up significant amounts of water when exposed to up to 94% {RH}. {T}hese results demonstrate that the direct radiative effect of {A}frican dust in this region remained independent of {RH} and an external mixing state could be considered for evaluating the climate effects of dust.}, keywords = {mineral dust ; long-range transport ; hygroscopicity ; optical properties ; particle shape ; mixing state ; {CARAIBE} ; {PORTO} {RICO} ; {ATLANTIQUE} ; {MAURITANIE} ; {SAHARA} ; {ALGERIE}}, booktitle = {}, journal = {{G}eophysical {R}esearch {L}etters}, volume = {42}, numero = {18}, pages = {7835--7843}, ISSN = {0094-8276}, year = {2015}, DOI = {10.1002/2015gl065693}, URL = {https://www.documentation.ird.fr/hor/fdi:010065402}, }